David Letterman conjured up Holy Ghost! on Thursday night’s episode of the Late Show. The synth-adoring NYC duo hit the stage and offered up a “Disco Halloween” by performing Dynamics track “Dumb Disco Ideas” along with members of their touring band. (Be sure to watch till the end to catch Dave quip to all seven players on stage, “Are you all part of the duo? What is this — for tax reasons?”) Oddly enough, the thrumming and bumping bassline took on a creepy enough effect, given the holiday at hand — or maybe we just downed way too much spiked cider in the past 24 hours, and everything is coming up ghosts and goblins.

Whatever the case may be, you can catch Holy Ghost!’s Letterman showing above.